Granted Patent
Utility
US 4,347,785 · App. 06/127,431
Engraving printing cylinders
Inventors:
Bryan Chase, Alberto Yi
Patented Case
View Patent ↗
Granted: Sep 7, 1982
Filed: Mar 5, 1980
Inventors
Bryan Chase
Alberto Yi
Assignee (at issue)
Crosfield Electronics Limited
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.